merkel's first visit to the white house since that report that the nsa had monitored her cell phone. later this morning, the two leaders will hold a press conference in the rose garden. >>> and a new report on the disappearance of flight 370 suggests the search was in trouble from the start with confusion, misinformation and delays. the malaysian government revealed that it took four hours to launch a rescue. and air traffic controllers didn't even realize the flight was missing until 17 minutes after it vanished. >>> and there's breaking news, now, from south korea. a collision on one of seoul's major subway lines. we're hearing one train slammed into another, which was stopped for mechanical reasons. there's dozens of people injured. we'll stay on top of this throughout the morning and bring you the very latest. >>> new, alarming details about this week's botched execution in oklahoma. the needle was inserted into clayton lockett's thigh, after no other suitable vein could be found. some of the drugs never made it into his system because a collapsed vein was not noticed for 21 minu